Columns• Best Business Practices: How to Become A Market Leader By Dave Schenk, H-P Products Inc.• Is There A Right Time For Sales Training? By Dave Kahle, The DaCo CorporationInterstate Engineering – Aerodynamic Design By Tom Gasko, Curator, Tacony Vacuum Museum• Commercial Cleaning Comes Home With New Sanitaire Professional Line By David Parkes, Electrolux Commercial Division• Mine The Gold In Service By Larry Hartley, Electrolux Central Vacuum Systems